Powder dispenser for printed webs



173', 1968 cs. v. WHEELER 3,396,872

POWDER DISPENSER FOR PRINTED WEBS Filed April 20, 1966 NU ENTO K GEORGEWHE'EZEIQ (E 0 E Q av United States Patent 3,396,872 POWDER DISPENSERFOR PRINTED WEBS George V. Wheeler, 1212 E. Henry Clay St., Milwaukee,Wis. 53211 Filed Apr. 20, 1966, Ser. No. 543,936 1 Claim. (Cl. 222-193)ABSTRACT OF THE DISCLOSURE A container disposed above a printed webholding a quantity of powder over a roll which rotates and deposits thepowder on the web below, and the container held powder is in contactwith the roll between a doctor blade of resilient material and a stripof shim stock set to allow a certain amount of powder to pass betweensaid strip and the roller, and an adjacent apertured tube emittingcompressed air to blow said powder against the web.

This invention relates to improvements in powder dispensers for printedwebs, and is an improvement on my invention disclosed in a priorapplication bearing the Ser. No. 453,427, now US. Patent No. 3,305,141,and filed in the US. Patent Oflice on May 5, 1965.

An object of the invention is to provide a device of the type which willdistribute powder more evenly on a printed web than has been possiblewith apparatus of the same character in prior use.

Another object of the invention is to provide a compressed air tubehaving a plurality of aligned air discharge orifices of novel designyielding increased capability in uniformity of powder distribution.

Other and further objects of the invention will appear as thedescription proceeds, reference being had to the accompanying drawing,in which:

*FIG. 1 is an end view partly broken away of a powder dispenserembodying the invention.

FIG. 2 is a front view partly in elevation and partly in section.

FIG. 3 is a cross-sectional view taken on line 3-3 of FIG. 2.

FIG. 4 is a plan view of the device partly broken away.

FIG. 5 is a fragmentary inverted view of the air distribution tube.

FIG. 6 is a cross-sectional view taken on line 66 of FIG. 5.

In the drawing, the dispenser 10 has a top 11, a rear wall 12, end walls13 and 14, and the frontal wall 15.

A transverse angle member 16 depends from the top 11 and has securedthereto by threaded means 17, the flexible curvate blade 18, formed oftwo thousandths shim stock, which bears against the top of the roller19. A second transverse angular member 20 has one portion 21 thereofafiixed to the rear wall 12 with the other 3,396,872 Patented Aug. 13,1968 portion 22 thereof projecting downwardly at an acute angle, andhaving subjoined thereto the relatively thick resilient strip 23retained with a transverse strap 24 thereunder by threaded means 25.

The free edge 26 of the strip 23 is beveled at 27 and bears against theroller 19, serving to retain the powder contents 28 prior to itsmovement under the blade 18 during the rotation of the roller 19.

A transverse tube 30 is connected with a source of compressed air andhas a plurality of aligned apertures 31 longitudinally disposed therein.As shown in FIG. 6, the apertures 31 are exteriorly countersunk as at32, resulting in Wider diffusion of the projected powder 28.

The resilient element 23 also serves to remove any accumulation on theroller 19 during the rotation of the latter. The element 18 is setduring manufacturing assembly to permit passage on the roller 19 of justthe correct amount of powder 28, and the compressed air emitted throughthe countersunk apertures 32 will distribute said powder over theprinted web 33.

A motor 34 coupled with a gear reducer 35 operates the shaft 36 providedwith sprocket 37 connected by chain 38 with the sprocket 39 mounted onthe shaft 40 connected with the roller 19 for rotation of the latter.

Having thus described the invention, it will be understood that thedevice is capable of many modifications in structure and design, withoutdeparting from the spirit of the invention, within the scope of theappended claim.

What is claimed and desired to be secured by Letters Patent of theUnited States is:

1. A device of the character described including a hopper for powderedmaterial, a roller mounted therein, an elongate angle member within thetop of said hopper over said roller, a curvate blade of shim stock fixedto a vertical face of said angle member and bearing against the top ofsaid roller to limit the quantity of powder passing therethrough duringrotation of said roller, a resilient strip held in parallel andlaterally of said roller, a bevelled free edge thereof bearing againstsaid roller to free it of any accumulation of powder thereon as itrotates, and a compressed air tube disposed above one side of saidroller having a plurality of aligned externally countersunk aperturesfor blowing powder downwardly off said roller onto a web movingthereunder.

References Cited UNITED STATES PATENTS 3,114,482 12/ 1963 Dunaway 222548X 3,221,938 12/1965 Yonkers et al. 222-194 X 3,238,919 3/1966 Meyer1014l6 X ROBERT B. REEVES, Primary Examiner.

F. R. HANDREN, Assistant Examiner.

